CurrentAmbetter NevadaPolicy CP.MP.126

Sacroiliac Joint Fusion (PDF)

Defines medical necessity criteria for open and minimally invasive sacroiliac joint (SIJ) fusion procedures, lists indications considered not proven, and specifies implant approach restrictions and supporting/non-supporting CPT codes.

Policy Summary

PayerAmbetter Nevada

PolicySacroiliac Joint Fusion (PDF)

Policy CodePolicy CP.MP.126

Change TypeRevised/Clarified coding and criteria

Effective Date

Next Review Date

Key ActionDocument at least six months of conservative treatment, required imaging and diagnostic injection results, and ensure minimally invasive procedures use the lateral transarticular approach; implants not transfixing the joint are not supported.

SourceLink

POLICY UPDATE CHANGES

Added Criteria II.I requiring procedure to be performed using the lateral transarticular approach and added Criteria IV addressing implants other than transfixing devices.

Added requirement of at least 75% pain reduction on diagnostic SIJ injection on two separate occasions and removed 'at least two weeks apart' wording.

Added CPT code 27278 to codes that do not support coverage criteria and removed deleted code 0775T from exclusions.

Added 'at least four to six weeks' to therapeutic exercise requirement and option for inability to tolerate exercise program.

2CPT codes supporting coverage

1CPT codes not supporting coverage

75%

Diagnostic injection threshold

6 moConservative treatment duration

Coverage Summary

This policy (Reference Number CP.MP.126, status CURRENT) defines medical necessity criteria for both open and minimally invasive sacroiliac joint (SIJ) fusion. The stance is mixed: open SIJ fusion is permitted for specific clinical indications, and minimally invasive SIJ fusion is conditionally covered when all specified criteria are met. Key required thresholds include at least 6 months of conservative treatment, and ≥75% pain reduction after an image-guided, contrast-enhanced intra-articular diagnostic SIJ injection on two separate occasions. For minimally invasive procedures, the policy requires use of the lateral transarticular approach. Relevant CPT coding guidance identifies codes that support coverage (e.g., 27279, 27280) and codes that do not support coverage (e.g., 27278).

Key thresholds and policy statistics

Conservative treatment duration>= 6 months

Therapeutic exercise duration4-6 weeks (within conservative treatment) or documented inability to tolerate

Diagnostic SIJ injection pain reduction>= 75% reduction for expected anesthetic duration on two separate occasions

CPT codes supporting coverage (count)2

CPT codes not supporting coverage (count)1

Medical Necessity Criteria

Medically Necessary - Open SIJ Fusion

Open sacroiliac joint fusion is medically necessary for any of the following indications:

ANY of the following

Stabilization of a traumatic, severe disruption, or fracture of the pelvic ring
As an adjunct to sacrectomy or partial sacrectomy for the treatment of sacral tumors
As an adjunct to the medical treatment of sacroiliac joint infection or sepsis (e.g., osteomyelitis, pyogenic sacroiliitis)
During multi-segment spinal constructs (e.g., correction of spinal deformity in scoliosis or kyphosis surgery, extending to the ilium)

Coding

Codes that support coverage criteriaCPTCovered

27279	Arthrodesis, sacroiliac joint, percutaneous or minimally invasive (indirect visualization), with image guidance, includes obtaining bone graft when performed, and placement of transfixation device.
27280	Arthrodesis, sacroiliac joint, open, includes obtaining bone graft, including instrumentation, when performed

Codes that do not support coverage criteriaCPTNot Covered

27278

Arthrodesis, sacroiliac joint, percutaneous, with image guidance, including placement of intra-articular implant(s) (eg, bone allograft(s), synthetic device(s)), without placement of transfixation device.

Provider Actions & Billing Rules

Documentation Required

Conservative therapy documentation

Document at least six consecutive months of conservative treatment that includes medication optimization (unless contraindicated), activity modification, and at least four to six weeks of active therapeutic exercise targeted at the lumbar spine, pelvis, SIJ and hip (including a home exercise program) or documentation that the member/enrollee is unable to tolerate such an exercise program.

Medication optimization (unless contraindicated)
Activity modification
At least 4–6 weeks of targeted therapeutic exercise or documented inability to tolerate

Documentation Required

Provocative test documentation

Document a positive response to at least three specified provocative sacroiliac joint tests.

Background and Evidence

Evidence summarized in the policy notes randomized controlled trials (Polly et al.) demonstrating improved pain and function for lateral transarticular minimally invasive SIJ systems (notably the triangular titanium iFuse implants) versus non-surgical management at 6 to 12 months. The document highlights that additional studies and longer-term radiologic confirmation are limited, and direct comparisons across different device systems remain sparse. The policy also states that posterior and non-transfixing (non-transarticular) implants and approaches lack sufficient evidence to support their use.

Evidence	Summary
RCTs (Polly et al.)	Randomized trials (Polly et al.) show improved pain and function for iFuse versus non-surgical management at 6-12 months.
Imaging timeframe requirement	Diagnostic imaging must be recent (within six months): plain radiographs and CT or MRI of the SIJ, plain radiographs of the pelvis, and CT or MRI of the lumbar spine to exclude other causes.

Medicare Local Coverage Determinations

Name	Number	Effective Date (include revised date)	Type
Minimally-invasive surgical (MIS) fusion of the sacroiliac (SI) joint	L36494	2016-02-01 (revised 2024-01-04)	LCD

Definitions

Transfixing device: An implant placed across the sacroiliac joint (through the ilium into the sacrum) to promote fusion.

Lateral transarticular approach: A surgical approach that places implants across the SIJ from the lateral ilium to the sacrum; this approach is required by the policy for minimally invasive SIJ fusion.

Revision History

06/23revised

Added Criteria II.I requiring procedure to be performed using the lateral transarticular approach and added Criteria IV addressing implants other than transfixing devices. Language updated replacing 'experimental/investigational' with 'long-term safety and effectiveness has not been proven' and removed specific device references.

05/24revised

Clarified diagnostic injection timing and response threshold: removed 'at least two weeks apart' and specified requirement of image-guided, contrast-enhanced intra-articular diagnostic SIJ injection on two separate occasions with at least 75% pain reduction.

04/25revisedLatest

Policy Summary

PayerAmbetter Nevada

PolicySacroiliac Joint Fusion (PDF)

Policy CodePolicy CP.MP.126

Change TypeRevised/Clarified coding and criteria

Effective Date

Next Review Date

SourceLink

On This Page

Medically Necessary - Minimally Invasive SIJ Fusion

Minimally invasive SIJ fusion is medically necessary when ALL of the following are met:

ALL of the following

Medication optimization (unless contraindicated)
Activity modification
At least four to six weeks of active therapeutic exercise targeted at the lumbar spine, pelvis, SIJ and hip, including a home exercise program or documentation of member/enrollee's inability to tolerate4-6 weeks

Non-radiating, typically unilateral pain that is caudal to the lumbar spine (L5 vertebrae), localized over the posterior SIJ, and consistent with SIJ pain, that interferes with activities of daily living (ADLs)

Localized tenderness with palpation of the posterior SIJ (sacral sulcus) in the absence of tenderness of similar severity elsewhere and other obvious sources of pain do not exist

Positive response to at least three provocative tests (thigh thrust, compression, sacral thrust, distraction, Gaenslen's, Patrick's test/FABER test)>= 3 tests

Absence of generalized pain behavior (e.g., somatoform disorder) or generalized pain disorders (e.g., fibromyalgia)

ALL of the following

Plain radiographs and CT or MRI of the SIJ that excludes destructive lesions (e.g., tumor, infection), fracture, traumatic SIJ instability, or inflammatory arthropathy
Plain radiographs of the pelvis to exclude concomitant hip pathology
CT or MRI of the lumbar spine that excludes neural compression or other degenerative conditions that can cause low back or buttock pain

At least 75% reduction in pain for the expected duration of the anesthetic used following an image-guided, contrast-enhanced intra-articular (diagnostic) SIJ injection on two separate occasions>= 75% on two occasions

Failure of at least one therapeutic intra-articular SIJ injection (i.e., corticosteroid injection), unless a therapeutic injection is contraindicated

Procedure will be performed using the lateral transarticular approach

Not proven / Not supported

Long-term safety and effectiveness not proven for other indications and implant types

Long-term safety and effectiveness of SIJ fusion (open or minimally invasive) has not been proven for other indications including, but not limited to, treatment of mechanical or axial low back pain, radicular pain syndromes, sacral insufficiency fractures, and pelvic girdle pain

SIJ fusion using implants other than those placed across the joint (transfixing) to promote fusion (e.g., allograft, nonmetallic implants) is not supported by current evidence

Thigh thrust
Compression
Sacral thrust
Distraction
Gaenslen's
Patrick's test / FABER test

Documentation Required

Imaging documentation

Provide recent diagnostic imaging obtained within six months that excludes alternative causes of pain and destructive lesions.

Plain radiographs and CT or MRI of the SIJ (to exclude tumor, infection, fracture, traumatic SIJ instability, or inflammatory arthropathy)
Plain radiographs of the pelvis (to exclude concomitant hip pathology)
CT or MRI of the lumbar spine (to exclude neural compression or other degenerative conditions causing low back/buttock pain)

Documentation Required

Diagnostic injection results

Document at least 75% reduction in pain for the expected duration of the anesthetic after an image-guided, contrast-enhanced intra-articular diagnostic SIJ injection on two separate occasions, and document failure of at least one therapeutic intra-articular SIJ injection (e.g., corticosteroid) unless a therapeutic injection is contraindicated.

>= 75% pain reduction after diagnostic image-guided, contrast-enhanced intra-articular SIJ injection on two separate occasions
Failure of at least one therapeutic intra-articular SIJ injection unless contraindicated

Billing Rule

Procedure approach restriction

Minimally invasive SIJ fusion must be performed using the lateral transarticular approach and implants placed to transfix the joint in order to meet policy criteria. Implants that do not transfix the joint are not supported by current evidence.

Affected CPT codes supporting coverage: 27279
CPT code that does not support coverage under these criteria: 27278 (per code table, does not meet coverage criteria)

Code table updates to reflect current CPT coding: added CPT code 27278 to codes that do not support coverage criteria and removed deleted code 0775T from exclusions; refined conservative therapy specifications by adding 'at least four to six weeks' to therapeutic exercise requirement and option for inability to tolerate exercise program.